Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of cbnl-e3.e3 series tandem gear pump in China, also supports customized service. If you're going to wholesale high quality cbnl-e3.e3 series tandem gear pump made in China, welcome to get pricelist from our factory.
Product Introduction
Some machines need two hydraulic circuits. Steering needs one. The implement needs another. But there's only one engine, one PTO, one drive source.
You could mount two separate pumps. Two couplings, two sets of plumbing, two mounting points. Or you could mount one tandem pump.
The CBNL-E3.E3 series tandem gear pump is that tandem pump. Two independent pump cores in one housing, driven by one shaft. One installation, two circuits. Less space, fewer parts, simpler plumbing.
The primary unit handles the main circuit - high flow, stable output. The secondary unit handles the auxiliary circuit - lower flow, precision control. Both run off the same drive, but they operate independently.
If your equipment needs two hydraulic circuits from one engine, this is the pump that does it without taking up twice the space.
One drive, two circuits - why it matters
A single pump gives you one circuit. If you need two, you have options.
Option one: Two separate pumps, each with its own coupling and drive. Works, but it takes up space. More parts, more plumbing, more potential leak points. Takes longer to install.
Option two: One tandem pump. Two pump cores in one housing, one drive. Takes up less space, fewer parts, simpler plumbing. Faster to install, easier to maintain.
The CBNL-E3/E3 is option two. It's not about performance - both options work. It's about packaging and simplicity. When space is tight and you don't want twice the plumbing, the tandem pump makes sense.
This is why you see them on loaders, tractors, forklifts - equipment with multiple hydraulic functions and limited space under the hood.
Product description
CBNL-E3/E3 series double gear pumps
CBNL-E3/E3 type Tandem Gear Pumps
APPLICATIONS&FEATURES
CBNL tandem gear pump is made from high strength aluminum. Advanced
Technical:such as axial clearance floating offset, radial balance, DU lubrication are applied.
It has advantages of highly efficient, high pressure, lower noise, resistant-vibration and long working lift and so on. It's widely used on forklift,loading
Truck,mining machines, hoist,road roller and light industry machines,environment, farming machines and so on.
How a tandem pump works - the short version
Two pumps stacked together in one housing, sharing one input shaft.
The drive shaft enters from one end and drives both pump cores. Each pump core has its own gears, its own inlet port, its own outlet port, its own pressure chamber. They share the housing and the drive shaft, but that's where the sharing stops.
Primary unit. Larger displacement, higher flow. Feeds the main circuit - steering, lifting, main actuators.
Secondary unit. Smaller displacement, lower flow. Feeds the auxiliary circuit - pilot controls, small implements, secondary functions.
Because they share a drive shaft, both units run at the same speed. Flow output depends on each unit's displacement. You size each unit independently based on the circuit it serves.
Two circuits, one drive. Simple. Compact. Independent control.
Where the CBNL-E3.E3 series tandem gear pump fits
The CBNL-E3.E3 series tandem gear pump is for equipment that needs two independent circuits from one drive:
Loaders - steering circuit + implement circuit
Tractors - main hydraulics + auxiliary implements
Forklifts - lift circuit + steering circuit
Material handling - conveyor drive + auxiliary control
Automated lines - main power + precision control
If your machine has two hydraulic functions and limited space, the tandem pump is the practical solution.
Installation notes
Dual circuits. Two separate inlet and outlet circuits. Don't cross-connect them.
Drive coupling. One shaft drives both. Align it correctly - misalignment affects both circuits.
Suction lines. Each unit has its own suction line. Both must be sealed and unobstructed.
Housing drain. Two pump cores means more internal leakage. Size the drain line for two units, route separately back to the reservoir.
First start. Lubricate the housing before starting. Unload both circuits before starting.
About the company
Shijiazhuang Laiye Import & Export Trading Co., Ltd., part of Hebei Onederful® Hydraulic Technology Co., Ltd., has been making hydraulic components since 1988 - over 35 years.
We're a factory, not a trading company. Around 200 employees. Full in-house production: casting, machining, assembly, testing, phosphating.
Products go to Russia, Europe, the Middle East, South America, and Asia. ISO 9001 certified. Every pump is tested individually, with data linked to its serial number.
Transportation
Factory workshop
Exhibition
FAQ
Q: What type of pump is CBNL-E3/E3?
A: CBNL-E3/E3 is a high-performance dual hydraulic gear pump that integrates two independent pump cores into one pump body, enabling simultaneous or independent oil supply from both channels.
Q: What could be causing a single-channel output malfunction in CBNL-E3/E3?
A: If only one output is malfunctioning, the problem lies with the pump core or corresponding piping in that channel. Check for blockages in the corresponding suction line, sticking in the corresponding safety valve, and wear on the pump core. If the other channel is working normally, it indicates that the transmission and drive components are functioning correctly.
Q: Why are both pressure lines of CBNL-E3/E3 dropping simultaneously?
A: When both lines malfunction simultaneously, it's usually due to a fault in the common components, including slippage of the drive shaft coupling, low oil viscosity, insufficient oil level in the tank, or a clogged suction filter. First check the common components, then check each pump element.
Q: What could be causing excessive noise or vibration in the CBNL-E3/E3?
A: Common causes: Air intake in the oil suction line, misalignment of the coupling, excessively high oil viscosity, or loose mounting bolts.
Q: What could be causing oil leakage from the shaft seal of the CBNL-E3/E3?
A: Possible causes: Excessive back pressure in the housing return oil, aging shaft seal, or blockage in the suction line leading to increased housing pressure. When both pump cores of a tandem pump are operating simultaneously, the housing leakage may be greater than that of a single pump. The drain pipe must have sufficient diameter and a separate return oil supply.
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